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Judson Locke, Florida Institute of Technology, Melbourne, Florida, USA

University of Michigan Summer 2010 REU at CERN. Missing Transverse Energy and Jets in Proton-Proton Collision Events in the ATLAS Detector at CERN. Judson Locke, Florida Institute of Technology, Melbourne, Florida, USA Advisor: Richard Teuscher , Ph.D., University of Toronto,

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Judson Locke, Florida Institute of Technology, Melbourne, Florida, USA

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  1. University of MichiganSummer 2010 REU at CERN Missing Transverse Energy and Jets in Proton-Proton Collision Events in the ATLAS Detector at CERN Judson Locke, Florida Institute of Technology, Melbourne, Florida, USA Advisor: Richard Teuscher, Ph.D., University of Toronto, Toronto, Ontario, Canada Version 2

  2. Why Does CERN Exist? ? Tiny unicorns? Are quarks elementary? Dark energy? Dark matter? How good is the Standard Model? The LHC is a microscope.

  3. Why Spend the Money? • Pure science. • Technological advancement (i.e. the US manned spaceflight program). • PhDs.

  4. Protons

  5. y ←Beam Axis→ -z x

  6. y ←Beam Axis→ -z x

  7. y MuonSystem HCAL ECAL x Tracker Particle Tracks Energy Deposits Atlantis Event Display Software

  8. y “Jet” Jet energy is sum of energy in each calorimeter cell in a jet, corrected for the position of each cell. The proton beam is in the zdirection, so no missing energy should be in x or y. x “Jet” z (into page)

  9. Missing Transverse Energy (ETmiss) • Sometimes, the energy in x and/ory is nonzero. • Why missing energy? • Detector failures. • Neutrino production (neutrinos cannot be detected by ATLAS). • Mismeasurements of jets and muons. • New physics? • Exmiss= missing energy in x. • Eymiss= missing energy in y.

  10. “known” “unknown” “unknown” ROOT Histogram

  11. “known” “unknown” ROOT Histogram

  12. Over/Underflow Events • We have to explain events with energies in the “unknown” region. • Why? • New physics can be hiding here. • Background and detector problems could be here. • Before we claim new physics, we must understand our detector and background!!!

  13. Event 8688264 ETmiss = 67.3 GeV Exmiss= -66.2 GeVEymiss= -12.0 GeV Jet Muon Muon

  14. Event 8688264 ETmiss = 67.3 GeV Exmiss= -66.2 GeVEymiss= -12.0 GeV Jet ETmiss Muon

  15. Contribution • Catalogued interesting events from run 158045. • These events may be used for future studies to characterize the ATLAS detector and background. • A tiny contribution, but very illuminating for me.

  16. Rome CERN Paris Dardigny Rome Montreaux London

  17. Acknowledgements • Thanks to Travis Bain and NikolinaIlic for their contributions and help. • Thanks to Jeremy Herr, Jean Krisch, and Homer Neal for making the UM CERN REU operate. • This material is based upon work supported, in part, by the National Science Foundation. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. • Thanks to CERN and Wikipedia for pictures.

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